Evaluation of Results of Internal Fixation of Base Fifth Metatarsal Fractures

Background: The fifth metatarsal base fracture is a quite frequent fracture, occurring at a rate of 6 per 100,000 yearly. Fractures of the metaphyseal-diaphyseal junction (Jones fractures) have a higher rate of non-union and occasionally do require surgery. This research aimed to assess the findings of surgical treatment of a recent fracture base of 5th metatarsal in adults’ zone II, III by percutaneous intramedullary cannulated cancellous screws (4 mm and 6.5mm).

Methods: This prospective case series research was involved 21 adult patients with recent trauma and closed base of 5th metatarsal fractures. All participants were subjected to laboratory study, methods of radiological evaluation [Antero-posterior aspect of the foot, oblique aspect of the foot].

Results: AOFAS score was significantly different among age groups at 2 months and insignificantly different at 6 months. AOFAS score was insignificantly different between both sexes.

Conclusions: Percutaneous intramedullary cannulated cancellous screws fixation of base 5th metatarsal fractures with a cannulated cancellous screw 4mm,6.5mm has a high union rate (100%) with early mobilization and return to work and daily activity without need to do below knee cast or slab, so it decreases post cast stiffness rate. It also increases rate of union and healing by doing compression of the fracture site using the cannulated cancellous screw and keeping hematoma without evacuation. Using of larger screws in diameter like 6.5 mm to be fit in the medulla, is more beneficial than 4 mm screws.